Hand shakes
Remember to shake firmly. If you are a man, it is impolite to offer your hand to a local woman. If a local woman offers her hand, it is then OK to reciprocate. Some Arab men will shake non-local women's hands, some will not (it is ok too)!

Respect - a universal value - for each other's differences requires open-mindedness, tolerance, adaptability and obedience. Although I have not lived long enough to give wise advice, I have found that respecting yourself and other people (regardless of their social, economic, education status) is among the best policies. Ask Ali also highlights that it is "illegal to defame any member of the ruling families of any of the emirates."

Be thoughtful. "Even if you must compromise, don't embarrass your Arab colleagues in public."

Depending on the context, the opposites may be right.
In Arabic culture, it is impolite not to answer a phone call during meetings.
In Western culture, it is impolite to answer a phone call during meetings.
What if you are in a meeting with both Arabic and Western colleagues?
I remember a meeting that I attended in my first week working in Abu Dhabi. Half-way through the meeting, a phone rang. The most important person (who was originally from USA) said, "I'm glad it's not mine."

Arab people may raise their voices when they speak, not out of anger, but to emphasize a point.

Trust Arab people like to do business with those they trust (those whom they know or wit whom they have friends in common). Arab people don't like to do business over the phone or without initially meeting you.

visit the Sheikh Zayed Grand Mosque, the largest mosque in the UAE and the eighth largest mosque in the world. It also has a Center library. Gently step on the wool carpet (the most comfortable one I have ever had the blessing to walk on) in the main prayer hall. Admire the Swarovski crystals-decorated chandeliers.

Reshuffle your position (at an elevator, a doorway) to place an important person / guest to your right.

Dress modestly.

Remove your shoes before entering your host's home.

Refer the gulf as Arabian Gulf (not Persian gulf!)

Send a Ramadan Kareem (Blessed Ramadan) card at the beginning of the Ramadan month or an Eid Mubarak (Happy Mubarak) at the end of Ramadan, to your Muslim friends.

Wait until after Ramadan to approach Muslim businessmen with new ideas.

Offer local friends food - a symbol of goodwill and friendship, especially home-cooked food if you know how to cook. Remember to exclude pork or alcohol (even in chocolates)!

Do not touch anyone of the opposite sex. No gentle pat.

Do not schedule any meeting / gathering / sport event on Fridays, at least not until after 4 pm because, to respect people's need of praying.

Do not leave your host's home before coffee and Arabic sweets are served (or else they may feel that they have not completed their hospitality duties; hospitality is an important value here, rooted in the harsh desert conditions).

Do not point your soles / the bottom of your fee towards anyone, especially someone's face.